MAX1720EUTG ON Semiconductor, MAX1720EUTG Datasheet - Page 13

• Manufacturer Part Number: MAX1720EUTG
• Description: IC INVERTER CHRG PUMP VOLT 6TSOP
• Manufacturer: ON Semiconductor
• Type: Switched Capacitor (Charge Pump), Invertingr

Specifications of MAX1720EUTG

• Internal Switch(s): Yes
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Voltage - Output: -1.5 ~ -5.5 V, 3 ~ 11 V
• Current - Output: 50mA
• Frequency - Switching: 12kHz
• Voltage - Input: 1.5 ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: SC-74-6
• Power - Output: 313mW
• Function: Inverting
• Output Voltage: - 5.5 V to - 1.15 V
• Output Current: 100 mA
• Maximum Operating Temperature: + 150 C
• Mounting Style: SMD/SMT
• Operating Supply Voltage (min): 1.15V
• Operating Supply Voltage (max): 5.5V
• Package Type: TSOP
• Pin Count: 6
• Mounting: Surface Mount
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: MAX1720EUTGOS

devices. The output current capability is approximately equal to the number of devices paralleled. A single shared output capacitor
is sufficient for proper operation but each device does require it’s own pump capacitor. Note that the output ripple frequency will
be complex since the oscillators are not synchronized. The performance characteristics for a converter consisting of two paralleled
devices is shown below.
transistors and two Schottky diodes. The output voltage is approximately equal to −V
both transistors and the forward voltage of both diodes. The performance characteristics for the converter are shown below. Note
that the output resistance is reduced to 0.9 W.
An increase in converter output current capability with a reduction in output resistance can be obtained by paralleling two or more
The output current capability of the MAX1720 can be extended beyond 600 mA with the addition of two external switch
Curve
A
B
V
in
Figure 37. External Switch for Increased Negative Output Current
V
in
5.0
3.0
+
(V)
−V
C
out
3
Figure 38. Current Boosted Load Regulation, Output Voltage vs. Output Current
= V
R
out
14.5
1
2
3
17
in
(W)
−V
BE(Q1) −
OSC
−2.2
−2.4
−2.6
−2.8
−3.0
−3.2
V
http://onsemi.com
BE(Q2)
0
MAX1720
6
5
4
−2 V
13
0.1
F
−1.0
−2.0
−3.0
−4.0
−5.0
0
I
out
0
Q
Q
, OUTPUT CURRENT (mA)
2
1
0.2
Figure 36. Parallel Load Regulation, Output
C
C
Q
Q
T
+
A
10
1
3
1
2
C
= C
= 220 mF
= 25°C
= PZT751
= PZT651
1
2
20
= 470 mF
0.3
Voltage vs. Output Current
in
I
out
minus the sum of the base emitter drops of
30
+
, OUTPUT CURRENT (mA)
0.4
40
C
B
2
−V
V
R
T
50
A
in
A
out
out
= 25°C
= 5.0 V
= 0.9 W
0.5
60
70
0.6
80
90
100